package lab02.test36;

/**
 * Created by w on 2017/11/9.
 */
public class Postgraduate extends Student{
    String calGrade(){
        double avg=calAverage();
        if (avg >= 90 && avg <= 100)
            grade = "优秀";
        else if(avg >= 80 && avg < 90)
            grade = "良好";
        else if( avg >= 70 && avg < 80)
            grade = "一般";
        else if(avg >= 60 && avg < 70)
            grade = "及格";
        else
            grade = "不及格";
        return grade;
    }
}
